Safety-gate for drawbridges.



No. 809,817. PATENTED JAN. 9, 1906. J. B. LARDINOIS.

SAFETY GATE FOR DRAWBRIDGES.

APPLICATION nun SEPT. 1, 1905.

2 SHEETS-SHEET 1- I. I k Inventor is by Attorneys 2 SHEETS-SHEET 2.

J Inventor Attorneys PATENTED JAN. 9, 1906.

Jaimardwzs J. B. LARDINOIS. SAFETY GATE FOR DRAWBRIDGES.

APPLICATION FILED SEPT 1 1905 Witnesses UNITED STATES V ATENT OFFICE.

JOHN B. LARDINOIS, OF BRUSSELS, WISCONSIN, ASSIGNOR OF ONE-HALF TOGABRIEL PIERRE, OF BRUSSELS, ISOONSIN.

SAFETY-GATE FOR DRAWBRIDGES.

Specification of Letters Patent.

Patented Jan. 9, 1906 Application filed September 1, 1905. Serial No.276,748.

To a, 1071/0777 if nan/y concern:

Be it known that 1, JOHN B. LARDINOIS, a citizen of the United States,residing at Brussels, in the county of Door and State of WVisconsin,have invented a new and useful Safety-Gate for Drawbridges, of which thefollowing is a specification.

This invention relates to safety-gates for drawbridges, and has for itsobject to provide a device of the class embodying new and improvedfeatures of simplicity, efficiency, and durability.

A further object of the invention is to provide a device of the classembodying a vertically-slidable gate disposed at the end of the abutmentto the draw and having weighted levers supported upon struts pivotedbeneath the approach and capable of raising the gate and closed and heldnormally closed by a cam carried by the bridge.

\Vith these and other objects in view the present invention consists inthe combination and arrangement of parts, as will be hereinafter fullydescribed, shown in the accompanying drawings, and particularly pointedout in the appended claims, it being understood that changes in theform, proportion, size, and minor details may be made without departingfrom the spirit or sacrificing any of the advantages of this invention.

In the drawings, Figure 1 is a perspective view of a conventionaldrawbridge with the improved gate applied. Fig. 2 is a transversesectional view with the bridge closed. Fig. 3 is an end view of one ofthe abutments with the bridge open. Fig. 4 is a view in side elevationof a bridge-abutment with the improved gate mounted thereon with amodified form of actuating mechanism.

Like characters of reference indicate corresponding parts in all of thefigures of the drawings.

The safety-gate forming the subject-inatter of this application isadapted for use upon a swinging bridge of the ordinary constructionhaving a draw-span 10, swinging upon a central pier l1 and communicatingwith the approaches 12 and 13, supported on any approved form ofabutments, as 14 and 15. Adjacent the end of the approach registeringwith the draw-span is formed a transverse groove 16, communicating withopenings 17 through the flooring of the approach. l/Vithin the groove isdisposed a bar 18, having its opposite ends 19 bent at right angles andde-' pending through the openings 17. Transversely beneath the approachis disposed the beam 20, secured to the ends 19 of the bar 18 andtogether therewith forming the verticallyslidable gate. The beam 20slides along avertical guide 21, and to hold the gate at its upwardlimit levers 22 are provided, pivotally secured at one end to the beam,as by staples 23, and at the other end carrying weights 24. At 25, apoint intermediate their ends, the levers 22 are pivoted upon the upperends of struts 26, which are in turn pivoted, as at 27, to the abutmentand their movements limited by the pins 28. Centrally of the beam 20 ismounted a roller 29, and upon the ends of the swing-span are mounteddepending curved cams 30, proportioned and disposed to engage anddepress the roller 29.

To raise the gate, springs 31 may be substituted for the weights, asshown in Fig. 4, and may be of any approved form and attached to theabutment in any approved manner.

lVith the parts assembled as shown in Fig. 1, the gate is wholly out ofthe way and offers no obstruction to travel or any other use of thebridge. hen, however, the draw is opened, the cam 30 rides off from theroller 29, which leaves the gate free to be raised by the weight 24.When the draw is closed, the cams 30 engage the rollers and depress thegate again to the position shown in Figs. 1 and 2.

Having thus described the invention, what is claimed is 1. Thecombination with a drawbridge of an abutment, a gate vertically slidableadj acent the end of the abutment, a strut pivotally connected at itslower end to the abutment, a lever pivoted upon the upper end of thestrut and with one end pivotally connected with the gate, a weightcarried on the end of the lever opposite the gate, a roller mounted onthe gate and a cam carried by the bridge disposed to engage and depressthe roller.

2. The combination with a drawbridge of an abutment, a beam mountedtransversely and movable vertically of the abutment, a gate carried bythe beam, a strut pivoted at its lower end to the abutment, a leverfulcrumed upon the strut and at one end to the beam, a weight carried bythe lever at the end opposite the beam, a roller mounted beam, a weightcarried by the lever at the end opposite the beam, a roller mounted uponthe beam and a cam carried by the bridge to engage and depress theroller.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

JOHN B. LARDINOIS. Witnesses:

L0U1s BAssINE, GABRIEL PIERRE.

